Detection of current induced spin polarization in epitaxial Bi2Te3 thin film

We electrically detect charge current induced spin polarization on the surface of a molecular beam epitaxy grown Bi2Te3 thin film in a two-terminal device with a ferromagnetic MgO/Fe contact and a nonmagnetic Ti/Au contact. The two-point resistance, measured in an applied magnetic field, shows a hys...

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Bibliographic Details
Published in:Applied physics letters 2017-03, Vol.110 (12)
Main Authors: Dey, Rik, Roy, Anupam, Pramanik, Tanmoy, Rai, Amritesh, Heon Shin, Seung, Majumder, Sarmita, Register, Leonard F., Banerjee, Sanjay K.
Format: Article
Language:English
Subjects:
Applied physics
Bismuth tellurides
Charge transport
Electric contacts
Epitaxial growth
Ferromagnetic materials
Hysteresis
Kinetic theory
Magnetism
Magnetization
Molecular beam epitaxy
Polarization (spin alignment)
Thin films
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Summary:We electrically detect charge current induced spin polarization on the surface of a molecular beam epitaxy grown Bi2Te3 thin film in a two-terminal device with a ferromagnetic MgO/Fe contact and a nonmagnetic Ti/Au contact. The two-point resistance, measured in an applied magnetic field, shows a hysteresis tracking the magnetization of Fe. A theoretical estimate is obtained for the change in resistance on reversing the magnetization direction of Fe from coupled spin-charge transport equations based on the quantum kinetic theory. The order of magnitude and the sign of the hysteresis are consistent with the spin-polarized surface state of Bi2Te3.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4978691